Speed and Minimal Traffic Disturbance - Collection drains for sewage treatment plant in Monaco rehabilitated with Brandenburger pipe liners
From the outside, the sewage treatment plant in the principality of Monaco, with its glass facade, looks like a modern office building. Situated in a busy area, right by the soccer stadium, the building fits harmoniously into the cityscape. Not even the nose registers that a sewage treatment plant is operating behind these walls.Those in charge of drainage for the city searched over five years for a partner which could rehabilitate the sewage lines into the plant and the outgoing clean water pipes. A prerequisite was that the rehabilitation would be completed quickly, without the construction disturbing traffic on the central traffic axis. Only one weekend was available for this. The advantages of speed and minimal traffic interference of the Brandenburger technique came into full play on this project.
With the Brandenburger Partner SMCE out of Mühlhausen, the right company to accomplish the job was finally found. The necessary seamless pipes were delivered ready-for-installation directly from the factory in Monaco and stood ready on schedule. The project was managed on-site by the director of Brandenburger Technical Applications, Peter Eschenbrenner, Dipl.-Ing. (graduate engineer). After all details of the rehabilitation process were discussed with the client and a detailed schedule was laid out, the sewage treatment plant was taken off-line. First, a complex bypass was installed, which carried off the incoming sewage during the rehabilitation.
All together four conduits, each with a diameter of DN 600, were to be rehabilitated that weekend. Due to the lack of intermediate shafts, the rehabilitation of two 171 m and two short 23 m pipes had to be prepared.
The seamless DN 600 pipe liners - the transport crates for the 171 m conduits weighed a grand four tons - were inserted into each conduit and sealed with special packing. The pipe liners were installed at 300 mbar pressure and cured with UVA light. For the curing, the team employed a chain of lights with radiation sources of 4x1000 W. The liner was cured at a rate of 60 cm/min. Thus the curing process for the 171 m lengths was completed in exactly 4 hours and 45 minutes. Without complications and exactly as planned, all four conduits were completed successively and the sewage treatment plant could be put back in operation.
The rehabilitation of the pipes at the sewage treatment plant in Monaco was the first Brandenburger project in the principality. Considering that the entire project was completed within one weekend and the customer was completely satisfied, Peter Eschenbrenner is certain that it will definitely not be the last. The Monacans themselves noticed the rehabilitation just as little as they notice the sewage treatment plant in front of their door. For them and for the drivers on the expressway on the Mediterranean coast, everything ran without complications as usual.
Left: Minimal traffic disturbance - the construction site at the sewage treatment plant in Monaco
Right: The liner is inserted into the shaft by means of a conveyor belt.
